I've been waiting for one too. I just have this fear of using a 3rd party app when it comes to financial stuff. I just want to know that I can blame WF if something goes go wrong with the app. I try to do as little banking on my phone as possible. I believe mobile phones to be the most unsecured device out there.

As a Wells Fargo customer, I just got an email today from Wells Fargo about the WF.com domain which is supposed to be smartphone friendly...not an app exactly but a phone optimized web app is better than nothing I suppose.